I dont think anything lives in my local creek (gardiners creek) besides carpGet some Pygmy perch and empires brother. Go down the local creek and catch some Galaxias pick up some Murray rainbows and you got a decent coldwater native tank. Moggies would murk anything in the tank they don’t like. If you wanna do tropics grabs some rainbows, empires, some perchlets and you’ll be sweet. Check out ANGFA for natives. I think you said you’re in vic so check it out. There’s a meeting in NSW this Saturday if your here.